Koch asked me in a comment to replicate an experiment done in 1950 by Helen A Crumley et al demonstrating Tobacco seed growth in deuterium oxide (D2O). The experiment is rather simple (and the figure from the paper is shown below) as Crumley placed 100 seeds in differing amounts of D2O (double distilled water, 33%, 66%, and 99.8% D2O) and analyzed the growth.

So here I am planning the experiment. I will change some things from their experiment. First they placed the seeds on wet cloths (paper towels?), and I will submerge the seeds in the water amounts they used. They also used a variety of plant species (tobacco, clover, radish, Kentucky bluegrass), where I will just use tobacco seeds (but I will try two different species). Finally they talk about their results in terms of percent germination, but it isn’t clear from the paper if they mean number of plants that have exhibited germination, or if they are referring to some amount of growth exhibited by each plant. I will look for both possibilities and report the results as I find them.

In a preliminary experiment I will submerge the plants in water in petri dishes and seal it with parafilm. I will be looking into a more airtight solution as time goes on. I also won’t do 100 seeds but probably on the order of 33 seeds per sample. And in the future I will look into figuring out a way to measure the seed growth.

Original Crumley paper can be found here.

This post is open to read and review on The Winnower.

I am on Trial 2 of the Repeating Crumley Experiment. Trial 1 was a pretty decent success, but I ran into some issues regarding image acquisition, experiment stability, and water evaporation. I made some adjustments and began the experiment again. Here is how I setup the second trial:

• There are 20 seeds of the Dark Virginia variety from the Tobacco Seed Company in each sample.
• There are 8 water samples: di water, deuterium depleted water, 33% d2o in di water, 66% d2o in di water, 99.9% d2o, 33% d2o in ddw, 66% d2o in ddw, and a sample of di water without any seeds.
• The sample of di water with no seeds is acting as a control to monitor the possibility of fungal/mold growth. 20 seeds were added to water and allowed to incubate in solution for 30 minutes. At the end of the incubation period the seeds were removed and the sample was sealed.
• The seeds were added to each sample container (analyslides), and a water type was added immediately after seed addition.
• After closing the samples, clear nail polish was added around the rim to seal the chambers from the surrounding environment.
• Data is taken using a Logitech HD Pro Webcam C910.

DOI: 10.15200/winn.142721.17145 provided by The Winnower, a DIY scholarly publishing platform